Regenerative furnace



Dec. 1, 1931. F. c. SIEMENS REGENERATIVE, FURNACE Filed June 28. 1928 2sh t s 1 ELY/62 91;

2 Sheets-Sheet Filed June 28, 1928.

Patented Dec. 1, 1931 PATE 'FFICE rnmnnion char; sIEMENs, or BERLIN, GRMANY,

' REGENERATiVE summon Y Application filed June 28, 1928, Serial No.288,994, and in Germany June 29, 1927.

My invention relates .to regenerative furnaces having two alternatingregenerators, a duct connecting them, means for alternate- 1y supplyinggas to the regenerators and a continuously operated burner for heatingthe tunnel of'the oven.

It is an object of my invention to effect a more uniform distribution ofthe air for combustion with respect to the burner, and to this end Iprovide an air distributing chamber for the burner which is connectedwith the duct.

In furnaces of the type referred to a 'horiz-ontal duct is provided fromwhich central passages supply air for combustion to the burner forheating the tunnelof the oven. Experience has shown-that the charge ofthe furnace, as ingots, is not heated uniformly as the quantities of airsupplied to the several nozzles of the burner are not equal but the.

major part of the air is supplied where the air is discharged from theregenerators.

This drawback of the uniflow regenerative furnaces as heretoforedesigned is overcome according to my invention by supplying the air forcombustion to the burner nozzles not directly but through a distributingchamber formed by a partition or arch in the duct connecting the tworegenerators having a central opening for admitting air to the burnernozzles. In this manner an antechamber is formed for the air flowing tothe burner in which such air is distributed uniformly and equal volumesof air are supplied to the nozzles of the burner the nunr ber of whichis a function of the width ofthe furnace.

I may arrange the distributing chamber above, below, or at the side ofthe passages to the tunnel of the furnace.

In the accompanying drawings, an end-toend and a transverse uniflowregenerative furnace are illustrated diagrammatically by way of example.

Fig. 1 is a longitudinal section on the line 1-1 of Fig. 2.

Fig. 2 is a section on the line 2-2 in Fig. 1, of the end-to-endfurnace.

Fig. 3 is a longitudinal section of a modiflame, which extendsdownwardly through fication of the invention taken on the line 33 ofFig. 4. y

r Fig. 4 is a'section on the line 4li of Fig. 3,

Referring first toFigs. l and2, b and 0" by thepassage (5', and soarethe regenerators Z) and 0; p and 4am gas nozzles at the ends of the duct6'; 0 is a valve foralternately supare the alternating regenerators forheating 55 plying gas to theregenerators; and mare Conduits ad g fromthe nozzles to the valve; m is a partition in the duct epn is a centralopening in the partition or arch'm;

ais a passage extending downwardly to the burner; z are m1x1ng chambers;h aregas nozzles, connected with a gas supply pipeiy' and g is thetunnel" of the furnace which 7 opens at the end of the furnace as it isof the end to-end type. 1 According'to Figures l and 2 the operation isas follows: the'regenerator 6 receives in such a manner that thegaspasses out of rises through d and passes into the duct fresh air, theregenerator o communicates ,Wlllh the, chimney. The valve 0 is adjustedwhere it is divided. The main portion passes through the opening 72and-the openings a (Fig. 1) downwards to the mixing chambers or burners2', is mixed with the gas supplied... through thenozzles h and forms thesubdi vided unidirected flame, which passes through the furnace-g. "Theremaindernof the air is drawn tojc, is mixed with the gas passing out ofthe nozzles and forms a the duct Z into the regenerator c and heats thelatter. The waste gases are drawn to the chimney. If the regenerator 0is sufficiently heated and b correspondingly cooled, the re r generatorsb andc as well as the valve 0 will 5 be reversed. The'air is now drawnthrough c, is heated and rises in Z," is divided fjin 6 passes to alarge extentthrough n to the furnaceburnersafi and forms a flamewithithez gas coming from p '(g is now cut off)= the said 100 -withithemixing chambers 2' flame passing downwards through (Z and 7) beingheated etc.

Referring now to Figs. 3 and 4, these illustrate a transverse furnacewith a somewhat modified arrangement. Identical parts are marked withthe same reference letters primed as in Figs. 1 and 2. Here the uptakes(5 and Z from the regenerators b and 0 are connected by a duct 6 whichis below the partition m, with its central opening a, the gas valve 0 isarranged at the. front end of the furnace and connected with the uptakesZ, cl through. short pipes -20" andg which correspond to the nozzles pand q in Figs. 1 and; 2. The partition m. separates a chamber from theduct 0 which is connected of the burner nozzles h.

The operation according to" Figures 3 and 4 is exactly the same as thatof Figures 1 and :2 except that the division of the preliminarilyheatedair'for combustion in 6" takes place'directlyabove the regenerators band c Z2 is heated, c" preliminarily heats the air. After the reversal,the air comes'from 6, gas is supplied through 9 in order to heat '0. Inany case, the main portion of the pre- 1 liminarily heated air passesupwards through at and forms flames with the fresh gas there "comingfrom the nozzles h, the said flames being properly developed in z" anddrawn into the furnace.

In the example illustrated in Figs. 1 and :2 the burner is below, and inthe example il- I l'ustrated in Figs. 8 and i it is above the dis-Obviously, the position to the burners may be variedfurther, forinstance; the duct and the'chamber may be arrangedatone side of theburner.

=1 am not limited to the types of furnaces illustratedyas myinventionmay be applied to any'suitable type of furnace.

1 claim:

1. A regenerative furnace having a furnace chamber and a pair ofalternative regenerating chambers, means providing a passage "way' fromone of said regenerating chambers toa' common region, means providing asecond passageway from the other. of said .re

generating chambers to said common region, "means 'providlng apassageway from said common region 'to said furnace chamber,

meansproviding a gas passageway com- =municating wi'th'said firstmentioned passageway between saidfirst mentioned regen- --.eratingchamber and said common region, -means providing a second gas passagewaycommunicating with, said second passageway between said otherregenerating chamber and said common. region, and valve means forcontrolling saidiga-s passageways.

:2. a A regenerative furnacehavin'ga furnace .chambernand a pair of.alternative regenerwatingchambers, means providing a passageway from oneof said regenerating chambers to a common region, means providing asecond passageway from the other of said regenerating chambers to saidcommon region, means providing a passageway from said common region tosaid furnace chamber, means providing a gas passageway communicatingwith said first mentioned passageway between said first mentionedregenerating chamber and said common region, means. providing-a-secondgas passageway communicating with said second passageway between saidother regenerating chamber and said common region, valve means forcontrolling-said gas passageways, and means providing another gaspassageway communieating with said passageway leading from said commonregion to said furnace.

